import {
    asyncRoutes,
    constantRoutes
} from '@/router'
import Layout from '@/layout'

/**
 * Use meta.role to determine if the current user has permission
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
    if (route.meta && route.meta.roles) {
        return roles.some(role => route.meta.roles.includes(role))
    } else {
        return true
    }
}

/**
 * Filter asynchronous routing tables by recursion
 * @param routes asyncRoutes
 * @param roles
 */
export function filterAsyncRoutes(routes, roles) {
    const res = []

    routes.forEach(route => {
        const tmp = {
            ...route
        }
        if (hasPermission(roles, tmp)) {
            if (tmp.children) {
                tmp.children = filterAsyncRoutes(tmp.children, roles)
            }
            res.push(tmp)
        }
    })

    return res
}

const state = {
    routes: [],
    addRoutes: []
}

const mutations = {
    SET_ROUTES: (state, routes) => {
        state.addRoutes = routes
        state.routes = constantRoutes.concat(routes)
    }
}

/**
 * 后台查询的菜单数据拼装成路由格式的数据
 * @param routes
 */
export function generaMenu(routes, data) {
    data.forEach(item => {
        let menu = {
            path: item.path === '#' ? item.id + '_key' : item.path,
            component: item.component === 'Layout' ? Layout : (resolve) => require([`@/views/${item.component}`],
                resolve),
            meta: item.meta
                // meta: { title: item.name, id: item.id, roles: ['admin'] }
        }
        if (item.hidden) {
            menu["hidden"] = item.hidden;
        }
        if (item.redirect) {
            menu["redirect"] = item.redirect;
        }
        if (item.name) {
            menu["name"] = item.name;
        }
        if (item.children) {
            menu["children"] = [];
            generaMenu(menu.children, item.children)
        }
        routes.push(menu)
    })
}

const actions = {
    generateRoutes({
        commit
    }, roles) {
        return new Promise(resolve => {
            let accessedRoutes
            if (roles.includes('admin')) {
                accessedRoutes = asyncRoutes || []
            } else {
                accessedRoutes = filterAsyncRoutes(asyncRoutes, roles)
            }
            commit('SET_ROUTES', accessedRoutes)
            resolve(accessedRoutes)
        })
    }
}

export default {
    namespaced: true,
    state,
    mutations,
    actions
}